Every kid is different. Some 6 year olds need one and others don't. Heck, we rented a double stroller for our trip last year for our kids and they were 8 and 5. And also the year before that. I wish we would've went with a single though last year because most of the time they were fine and didn't need it so we parked it for hours and eventually went back to get it. I just get one for just in case because I would rather have it and not need it than need it and don't have it, ya know? We're renting a single for our trip in a couple weeks. I still wear the baby but I may need a break and also my 6 year old may use it from time to time. I do think it'll be parked a lot of the time, lol. Anyway, it's a tough decision since 6 year olds don't usually use strollers, disney is a totally different situation. Good luck deciding!